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Old 06-11-2004, 10:21 PM   #1
Aphex
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Member#: 146
Join Date: Aug 1999
Location: Wahcheeta, KS
Vehicle:
'05 Legacy GT
Silver

Default fuel pump question

ok, I have a link + and a walboro 255 fuel pump.... today I got the link plugged in (PnP harness) and attached the other end of the fuel line to a bucket (engine is not in the engine bay) turned the key to on..... and nothing.

it didn't prime. will the fuel pump come on if all the connections in the engine bay are not connected?

the other part of the equation is I got the backwards walboro fuel pump, is the wiring backwards on it too? or only the inlet point?

I apologize I haven't done any electrical tests yet other than checking fuses..... I could be wrong, but I don't believe I even hear the relay kick on. everything else works fine, and I can even spin the starter if I turn it to start, but the fuel pump won't come on.

hopefully it's something simple, as I'm very easily demotivated I just wanted to pump some of this one and half year gas out of the tank. with the ECU disconnected, the fuel level would not change and the fuel light came on, now with it connected the fuel light is off and I get a fuel level on the guage so the ecu seems to be working. I haven't connected to the link yet as I need a different serial cable (only have null modem cables here).

thanks for any help.
Eli
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Old 06-12-2004, 02:07 AM   #2
Unsung Boxer
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Join Date: May 2003
Location: WA state
Default

some ECU's have different stratagies. Subaru, itself, i dont know. Many ECU's look to find Crank Position and a few other sensors before it will initiate the fuel pump. I dont know how u got this whole thing setup, but it probably wont turn on w/o CPS, TPS, and knock sensor hooked up.

I know that it will crank w/ out the COIL pack hooked up, but it wont pump fuel until it sees response from the coil. Therefore, if u have the Coil pack disenguaged, the fuel will not pump.

-Jake
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Old 06-12-2004, 02:55 AM   #3
Avenger
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Join Date: Apr 2000
Location: Vancouver, Canada
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2000

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All factory ecu primes the fuel system when the key is on for a sec or two and will shut down unless it see the engine running.
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Old 06-12-2004, 02:56 AM   #4
White 2.5rs
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Join Date: Jul 2003
Vehicle:
99RS TWE&SCAT EJ257
Hydra+HMist+PPG+35R=DEATH

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uh?
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Old 06-12-2004, 12:49 PM   #5
Aphex
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Location: Wahcheeta, KS
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'05 Legacy GT
Silver

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ok good, so I shouldn't go into panic mode until I get the engine put in and all the sensors hooked up . Thanks
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Old 06-12-2004, 01:25 PM   #6
White 2.5rs
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99RS TWE&SCAT EJ257
Hydra+HMist+PPG+35R=DEATH

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i was freakin out too i thought some controller on the ecu was shot but turns out i wasnt grounding parts of it so certian instructions werent being carried out
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